For roof slopes expressed as x in 12 rise in run the roof pitch multiplier is determined by finding the square root of rise run 1.
Roof multi plier.
The formula for the roof pitch multiplier comes from the famous pythagorean theorem.
The maths behind this number is that it is the square root of rise run 2 1.
Now solving for c in the equation above gives.
A roof pitch multiplier also called a roof pitch factor is a number that is multiplied by the area covered by a sloped roof to produce the area of the actual surface of the roof.
But is a big help and save a lot of time because you realy have the tool what you need especial when you aré on the roof on steep leader u ser a kitchen sink etc etc sorry for my english.
Take the area of the roof s footprint say it s 5 000 square feet and multiply 5 000 by 1 118.
And that s the number you were looking for.
That gives you 5 590 square feet which is the actual area of the surface of the roof.
This makes measuring easier knowing that you are able to get the exact measurement of roofs by merely standing on the ground.
The roof pitch multiplier is responsible for giving an accurate pitch measurement of the roof.
And for a roof with a slope of 6 12 that number 1 118 is your roof slope multiplier.